Ha ha, lol no. With the type Leafeon has, he won't have the time to use its 3 other moves before going down, and Last Resort is a Normal-type move, which don't have any super-effective hit, so that set-up is not worth it.
Return is the way to go of the two. 102 power is still nothing to laugh at, and you can use it immediately.
------------
On your Pokés, Cham Cham :
* It would be nice to know the role you want your Weavile to have. Do you want to make him a Choice Bander, or a Swords Dancer ?
If you're going the Choice Bander route, depending on if you want him to kill Ghosts or having the possibility to strike before the rare faster threats than Weavile, go with Pursuit or Ice Shard over Metal Claw.
If going for the Swords Dancer route, just replace Metal Claw with Swords Dance, and you're ready to go.
I hope your Weavile has a Jolly Nature, as it's the best nature for those roles.
* It seems you're gearing Leafeon on a Swords Dance set, seeing its moves. As it is, it's nearly perfectly fine. Just replace Iron Tail with X-Scissors IMO, since Iron Tail coverage is limited to Rock, which you beat with STAB Leaf Blade, and Ice, who often have a dual Water/Ice typing, negating the super-effectiveness.
With X-Scissors, at least you can hit Psychic, Dark, and other Grass-types. You also have the option of Quick Attack, if you prefer having an insurance against Salac Reversalers and want to damage your opponent a bit before going down.